Add support for GossipSub PX Peer Discovery #92
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This PR adds preliminary support for sourcing the peers to crawl via GossipSub Peer Exchange.
Upon connection to a peer we wait until the remote opens a gossipsub stream to us. Then we try to graft the remote peer and if that peer is already at capacity for a given topic it'll prune us while providing additional peers to connect to. The latter bit is the GossipSub Peer Exchange (PX) functionality.
For the Filecoin network (the only one that we know of that has this feature enabled) this means:
This means we find ~48% (!) more peers enabling gossipsub PX.